Theodore guilleaitme



(No Model.)

'TY GUILLEAUMB. MEANS EOE INSULATING ELECTRIC GONEUGTOES.

Patented July '7, 1896.

UNITED STATES PATENT OFFICE.

THEODORE-GUILLEAUME OF MLHEIM-ON-TllE-RHINE, GERMANY.

MEANS FR iNSULATlNG ELECTRIC CONDUCTORS.

SPEGFIECATII'T formingi part of Letters Patent No. 563,273, dated July '7, 1896.

Application filed March 19, 1895. Serial No. 542,376. (No model.) Patented in Belgium January, 31, 1895, No. 113,902; in France February 1, 1895, No. 244,792; in England February 4,1895, No, 2,430; in Hungary February 21,1895,No. 2,292; in Austria May 25, 1895, llo. l15/1,848 iu'India August 22, 1895,1l'o. 271; in New South Wales September 7, 1895,1lc, 6,043; in New Zealand September 14,1895,N0 7,893, and in GanadsNcvem'ber 15,1895,No. 50,602`

To @ZZ whom it may concern.'

Be it known that 1, THEoDoRE GUILLEAJUME, a subject ci. the German. Emperor, residing at hiilheir^f-ontheRhina in the German E1npire, have invented new and useful Improved Means for insulating Electric Conductors, (in respect whereof I have by my' agent obtained Letters Patent in Great Britain, dated February 4, 1895, No. 2,430; in France, dated February 1, 1895, No. 244,792; in Belgium, dated January 31, 1895, No. 113,902; in Austria, dated May 25, 1895, No. /1,848; in Hungary, dated February 21, 1895, No. 2,202 in British India, dated August 22, 1895, No. 271; in New South Wales, dated September 7, 1895, No. 6,043; in Canada, dated Never ber 15, 1895, No. 50,602; in New Zealand, dated. September 14, 1895, No. 7,893, and in respect whereof l have applied for but not yet obtained a patent in Germany to bear date January 21, 1895,) of which the following is a specification,

This invention relates to the insulation of electric conductors on the air-spacel systeni; and it consists in improved means for forming the air-space about the conductor4 and for preserving the saine against crushing. According to the usual practice, the air-space inclosing the conductor is circular in crosssection andvr'eadily yields to external pressure. Moreover, the conductor is, throughout its whole length, in contact with the material forming the walls of the air-space, the insulation being thereby prejudicially affected.

In. the accompanying drawings, Figure 1 is vanelevation of an electric conductor insulated according to the improved nietho'd, Fig. 2 being a longitudinal section. Figs. 3 and 4 are transverse sections of conductors respectively inclosed in quadrangular and triangular air-space insulating-tubesl Fig. 5 is a perspective view of a die or-foldnginstrument adapted for use in the production of' the said tubes, Fig. 6 being a face view of the entering end thereof, l

Accordin .to he improved method of construction, t e su ject of the present invention, the tube a, inclosing the air-space b and conductor c, is triangular, quadrangular, or polygonal in cross-section, and is twisted lonf gitudinally, Figs. l and 2. Owing to the angular form of the tube a it offers considcrably greater resistance to external pressure than is presented by a cylindrical tube, and owing to the conductor c following a course parallel with the axis of the said tube,and only touching the sides of the spiral air-chamsively is more nearly accomplished. The conductcr, moreover, in taking a straight course, is shorter, and therefore less costly,- than in a case where the conductor follows the convolutions of the air-inclosing tube.

ln the production of a twisted triangular, quadrangular, or polygonal tube for airspace insulation and in applying the same about an electric conductor a die or folding instrument of the character illustrated in Figs. 5 and 6 is employed. This instrument consists of two parts d cl', which resemble one another-in form, the part d being arranged within the part cl. ,Between these two parts is a passage e, through which the insulating material for forming the twisted tube a passes.

entering end, Fig. 6, andv gradually changes as it approaches the exit end to a triangular, quadrangular, or polygonal form, according to the shape of the air-inclosing tube to be produced. Through the center of the inner part there is formed an avenue f for the passage of the conductor c. While the material for forming the air-inclosng tube c traverses the passage e between the two parts d d of the folder or former, the instrument is rotated, the conductor c meanwhile traversing the central passage f. The conductor thus issues character, which tube may then be taped and conductors so insulated may be assembled in a cable.

Y What l claim as my invention, and desire to secure by Letters Patent, is-

1. 'An electric conductor insulated on the air-space system substantially as herein described, and consisting of a naked conduc ber at intervals, theinsulation by airexclu- This passage e is or may be annular at the inclosed within a-twisted tube of an angular provided with an outer sheathing, or several tor inclosed in a twisted angular tube of nonconducting material, the latter having spi? ral prominences and intervening spiral airspaces, the result of angularityof section and of twisting, the'points of the spiral prominences being alone in' contact With and sup.- porting the'conductor. l

2. The combination, With a naked electric conductor c, of a tubular envelop b of nonconducting material, angular in cross-section and twisted, so as to present in its internal surface spiral prominences with ,which the Conductor is alone in contact, substantially as set forth.

3. For use in the production of air-insulated 

